from_chars_first: generalized chars to value

Read the first valid sequence of characters from the string, skipping leading whitespace, and convert it using from_chars: generalized chars to value . More...

Functions
size_t	c4::from_chars_first (csubstr buf, uint8_t *v) noexcept
size_t	c4::from_chars_first (csubstr buf, uint16_t *v) noexcept
size_t	c4::from_chars_first (csubstr buf, uint32_t *v) noexcept
size_t	c4::from_chars_first (csubstr buf, uint64_t *v) noexcept
size_t	c4::from_chars_first (csubstr buf, int8_t *v) noexcept
size_t	c4::from_chars_first (csubstr buf, int16_t *v) noexcept
size_t	c4::from_chars_first (csubstr buf, int32_t *v) noexcept
size_t	c4::from_chars_first (csubstr buf, int64_t *v) noexcept
size_t	c4::from_chars_first (csubstr buf, float *v) noexcept
size_t	c4::from_chars_first (csubstr buf, double *v) noexcept
template<class T>
auto	c4::from_chars_first (csubstr buf, T *v) noexcept -> size_t::type
template<class T>
size_t	c4::from_chars_first (csubstr buf, T **v) noexcept
size_t	c4::from_chars_first (csubstr buf, bool *v) noexcept
size_t	c4::from_chars_first (csubstr buf, char *v) noexcept
size_t	c4::from_chars_first (csubstr buf, csubstr *v) noexcept
size_t	c4::from_chars_first (csubstr buf, substr *v) noexcept
size_t	c4::from_chars_first (csubstr buf, fmt::raw_wrapper *r)
	read a variable in raw binary format, using memcpy
size_t	c4::from_chars_first (csubstr buf, fmt::raw_wrapper r)
	read a variable in raw binary format, using memcpy

Detailed Description

Read the first valid sequence of characters from the string, skipping leading whitespace, and convert it using from_chars: generalized chars to value .

Return the number of characters read for converting.

Dispatches to the most appropriate and efficient conversion function.

See also

atou_first, atoi_first, atof_first, atod_first

Function Documentation

from_chars_first() [1/18]

size_t c4::from_chars_first ( csubstr buf, uint8_t * v )

inlinenoexcept

Definition at line 2410 of file charconv.hpp.

{ return atou_first(buf, v); }

from_chars_first() [2/18]

size_t c4::from_chars_first ( csubstr buf, uint16_t * v )

inlinenoexcept

Definition at line 2411 of file charconv.hpp.

{ return atou_first(buf, v); }

from_chars_first() [3/18]

size_t c4::from_chars_first ( csubstr buf, uint32_t * v )

inlinenoexcept

Definition at line 2412 of file charconv.hpp.

{ return atou_first(buf, v); }

from_chars_first() [4/18]

size_t c4::from_chars_first ( csubstr buf, uint64_t * v )

inlinenoexcept

Definition at line 2413 of file charconv.hpp.

{ return atou_first(buf, v); }

from_chars_first() [5/18]

size_t c4::from_chars_first ( csubstr buf, int8_t * v )

inlinenoexcept

Definition at line 2414 of file charconv.hpp.

{ return atoi_first(buf, v); }

from_chars_first() [6/18]

size_t c4::from_chars_first ( csubstr buf, int16_t * v )

inlinenoexcept

Definition at line 2415 of file charconv.hpp.

{ return atoi_first(buf, v); }

from_chars_first() [7/18]

size_t c4::from_chars_first ( csubstr buf, int32_t * v )

inlinenoexcept

Definition at line 2416 of file charconv.hpp.

{ return atoi_first(buf, v); }

from_chars_first() [8/18]

size_t c4::from_chars_first ( csubstr buf, int64_t * v )

inlinenoexcept

Definition at line 2417 of file charconv.hpp.

{ return atoi_first(buf, v); }

from_chars_first() [9/18]

size_t c4::from_chars_first ( csubstr buf, float * v )

inlinenoexcept

Definition at line 2418 of file charconv.hpp.

{ return atof_first(buf, v); }

from_chars_first() [10/18]

size_t c4::from_chars_first ( csubstr buf, double * v )

inlinenoexcept

Definition at line 2419 of file charconv.hpp.

{ return atod_first(buf, v); }

from_chars_first() [11/18]

template<class T>

auto c4::from_chars_first ( csubstr buf, T * v )->size_t::type

inlinenoexcept

Definition at line 2421 of file charconv.hpp.

{ return atoi_first(buf, v); }

from_chars_first() [12/18]

template<class T>

size_t c4::from_chars_first ( csubstr buf, T ** v )

inlinenoexcept

Definition at line 2424 of file charconv.hpp.

{ intptr_t tmp; bool ret = from_chars_first(buf, &tmp); if(ret) { *v = (T*)tmp; } return ret; }

from_chars_first() [13/18]

size_t c4::from_chars_first ( csubstr buf, bool * v )

inlinenoexcept

Definition at line 2509 of file charconv.hpp.

{
    csubstr trimmed = buf.first_non_empty_span();
    if(trimmed.len == 0 || !from_chars(buf, v))
        return csubstr::npos;
    return trimmed.len;
}

from_chars_first() [14/18]

size_t c4::from_chars_first ( csubstr buf, char * v )

inlinenoexcept

Definition at line 2546 of file charconv.hpp.

{
    if(buf.len < 1)
        return csubstr::npos;
    *v = buf.str[0];
    return 1;
}

from_chars_first() [15/18]

size_t c4::from_chars_first ( csubstr buf, csubstr * v )

inlinenoexcept

Definition at line 2583 of file charconv.hpp.

{
    csubstr trimmed = buf.first_non_empty_span();
    if(trimmed.len == 0)
        return csubstr::npos;
    *v = trimmed;
    return static_cast<size_t>(trimmed.end() - buf.begin());
}

from_chars_first() [16/18]

size_t c4::from_chars_first ( csubstr buf, substr * v )

inlinenoexcept

Definition at line 2636 of file charconv.hpp.

{
    csubstr trimmed = buf.first_non_empty_span();
    C4_ASSERT(!trimmed.overlaps(*v));
    if(C4_UNLIKELY(trimmed.len == 0))
        return csubstr::npos;
    size_t len = trimmed.len > v->len ? v->len : trimmed.len;
    // calling memcpy with zero len is undefined behavior
    // and will wreak havoc in calling code's branches.
    // see https://github.com/biojppm/rapidyaml/pull/264#issuecomment-1262133637
    if(len)
    {
        C4_ASSERT(buf.str != nullptr);
        C4_ASSERT(v->str != nullptr);
        memcpy(v->str, trimmed.str, len);
    }
    if(C4_UNLIKELY(trimmed.len > v->len))
        return csubstr::npos;
    return static_cast<size_t>(trimmed.end() - buf.begin());
}

from_chars_first() [17/18]

size_t c4::from_chars_first ( csubstr buf, fmt::raw_wrapper * r )

inline

read a variable in raw binary format, using memcpy

Definition at line 472 of file format.hpp.

{
    return from_chars(buf, r);
}

from_chars_first() [18/18]

size_t c4::from_chars_first ( csubstr buf, fmt::raw_wrapper r )

inline

read a variable in raw binary format, using memcpy

Definition at line 478 of file format.hpp.

{
    return from_chars(buf, &r);
}